Inverting the Screen Colours
You can invert the screen colours of the touch panel display. If you find it hard to read what is being shown on the touch panel display, try using this mode.
1.
Press 
(Settings/Registration).
(Settings/Registration). 2.
Press [Preferences] → [Accessibility] → [Reversed Display (Color)].
3.
Press [On] → [OK].
Select [Off] if you do not want to invert the colours.